Exploring 3137. To explore a different substance…

N-Phenyl-N-[1-(2-phenylethyl)-4-(1,3-thiazol-2-yl)piperidin-4-yl]propanamide
 3137  C25H29N3OS  419.582
 Fentanyl
 InChI=1S/C25H29N3OS/c1-2-23(29)28(22-11-7-4-8-12-22)25(24-26-16-20-30-24)14-18-27(19-15-25)17-13-21-9-5-3-6-10-21/h3-12,16,20H,2,13-15,17-19H2,1H3
 BSOGYUOSODTVSX-UHFFFAOYSA-N This stereoisomer Any stereoisomer
 CCC(=O)N(C1(CCN(CC1)CCc1ccccc1)c1nccs1)c1ccccc1